Weaknesses and Resistances

Ability

Moves targetting this Pokémon use one extra [PP]{mechanic:pp}.
This ability stacks if multiple targets have it. This ability still affects moves that fail or miss. This ability does not affect ally moves that target either the entire field or just its side, nor this Pokémon's self-targetted moves; it does, however, affect single-targetted ally moves aimed at this Pokémon, ally moves that target all other Pokémon, and opponents' moves that target the entire field. If this ability raises a move's PP cost above its remaining PP, it will use all remaining PP.
When this Pokémon enters battle, all participating trainers are notified that it has this ability.
Overworld: If the lead Pokémon has this ability, higher-levelled Pokémon have their encounter rate increased.

Hidden Power's power and type vary depending on the individual Pokemon using it, ranging between 30 and 70 power. There is no way to change a Pokemon's Hidden Power type or power, so you are stuck with what you have. Hidden Power is always a Special-based move.

I bet Giratina would be a guy who looks like Yoshida Haru or his brother Yuzan :P btw im a girl, and so im not disrespecting you, but... no... not Giratina would look so weird as a girl. (Dialga on the other hand would look so fly)

One of the many reasons it is awesome: It learns all of it's moves before, at, or (possibly) just a few levels after Level 50. Including Shadow Force. Also, it has awesome stats and an awesome movepool.